There are many reasons for the deformation of aluminum alloy parts, which are related to the material, the shape of the part, the production conditions, and the performance of the cutting fluid. DEYU Precision believes that the deformation of aluminum alloy parts mainly consists of deformation caused by internal stress of the blank, deformation caused by cutting force, cutting heat, deformation caused by clamping force and other factors.
In order to reduce the processing deformation, various measures can be taken to improve the process, thereby achieving the purpose of reducing deformation.
Reduce the internal stress of the blank. The natural stress of the blank can be partially eliminated by natural or artificial aging and vibration treatment.
Improve the cutting ability of the tool. Reasonable selection of tool geometry parameters to improve tool structure.
Improve the clamping method of the workpiece. For aluminum alloy thin-walled bushing parts, if the three-claw self-centering chuck or the spring collet is used for clamping from the radial direction, once the workpiece is loosened after machining, the workpiece is inevitably deformed. In this case, a method of compacting the axial end face with better rigidity should be utilized. Positioning the inner hole of the part, make a threaded threading mandrel, and insert the inner hole of the part, and press the end face with a cover plate and then tighten it with the nut. When the outer circle is machined, the clamping deformation can be avoided, and satisfactory machining accuracy can be obtained.
When processing aluminum alloy thin-walled sheet workpieces, it is recommended to use a vacuum chuck to obtain a uniform distribution of clamping force, and then to process with a small amount of cutting, which can prevent deformation of the workpiece.
Arrange the process reasonably. In high-speed cutting, due to large machining allowance and intermittent cutting, the milling process often produces vibration, which affects machining accuracy and surface roughness. Therefore, the numerical control high-speed machining process can be generally divided into: roughing-semi-finishing-clearing-finishing-finishing. For parts with high precision requirements, it is sometimes necessary to perform secondary semi-finishing before finishing. After roughing, the parts can be naturally cooled, eliminating internal stresses caused by roughing and reducing distortion.
The parts of the aluminum alloy material are deformed during the processing. In addition to the above reasons, the operation method is also very important in actual operation.
For parts with large machining allowance, in order to make them have better heat dissipation conditions during processing, and avoid heat concentration, symmetrical machining should be used during processing.
Shenzhen DEYU Precision is a company engaged in the processing of aluminum alloy parts in CN. It specializes in R&D, design and customized production of aluminum alloy, stainless steel, titanium alloy, copper and other materials.